Question

the average weight of 45 students of section B is 70 kg and average weight of 35 students of section C is 60kg .what is the average weight of both sections ?

Answer 1

130 kg
I am not sure that this answer is right

Answer 2

The average weight of both sections is 65.625 kg

Step-by-step explanation:

$Average = \frac{\text{Sum of all observations}}{\text{No. of observations}}$

The average weight of 45 students of section B is 70 kg

$70 = \frac{\text{Sum of weights of students of section B}}{45}\\70 \times 45 =\text{Sum of weights of students of section B}\\3150=\text{Sum of weights of students of section B}$

The average weight of 35 students of section C is 60 kg

$60 = \frac{\text{Sum of weights of students of section C}}{35}\\60 \times 35 =\text{Sum of weights of students of section C}\\2100=\text{Sum of weights of students of section C}$

So, Total weights = 2100+3150=5250

Average weight of both sections =$\frac{5250}{45+35}=65.625$

Hence The average weight of both sections is 65.625 kg

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